<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <input type="text" id="input">
</body>
<script>
  let data = {
    nema: 'harry'
  }
  let oldSix = ''
  Object.defineProperty(data, 'name', {
    get() {
      console.log('我被调用了');
      return oldSix
    },
    set(val) {
      console.log('data被修改了');
      console.log('data被修改了为',val);
      document.getElementById('input').value = val
      oldSix = val
    }
  })
  document.getElementById('input').addEventListener('input',(e)=>{
    data.name = e.target.value
  })
</script>

</html>